Tempus AI's stock experienced a significant pre-market plunge of 6.70% on Wednesday, following the release of its first-quarter financial results after the previous day's market close.

The company reported quarterly results that exceeded Wall Street expectations, with revenue of $348.12 million beating estimates and an adjusted loss per share that narrowed significantly year-over-year. Furthermore, Tempus AI raised its full-year 2026 revenue guidance.

Analysts attribute the pre-market decline to a classic "buy-the-rumor, sell-the-news" dynamic. The stock had surged more than 10% during the regular trading session on optimism surrounding the AI-driven healthcare sector and the upcoming earnings report. Once the positive results were confirmed, investors chose to lock in profits, leading to the sharp pullback in extended trading.